#navigation-bar>ul{
    list-style: none;
    padding: 0;
    margin: 0;
    overflow: hidden;
    text-align: center;
    line-height: 55px;
}
/* .tu1,.tu2,.tu3,.tu4{
    width: 200px;
    height: 400px;
} */
p{
    margin: 0px;
    text-align: center;
    font-size: 30px;
}
.lunbotu,.jieshaobiao{
    display: inline-block;
}

.item{
    margin-left: 35px;
    float: left;
    font-size: 35px;
}
.item01{
    margin-right: 20px;
    float: right;
    font-size: 20px;
}
.item02:hover{
    font-size: 40px;
    color: blue;
}
img{
    width: 730px;
    height: 450px;
    background-color: red;
}
#lunbotu{
    height: 450px;
    /* margin-left: 40px; */
}
img{
    position: absolute;
    opacity: 0;
}
.active{
    z-index: 1;
    opacity: 1;
}
#lunbotu>ul{
    width: 400px;
    height: 450px;
    list-style: none;
    float: right;
    padding: 0;
    margin: 0;
    overflow: hidden;
    text-align: center;
    line-height: 112.5px;
    
}
#lunbotu>img{
    transition: opacity 0.7s;
}
.li01,.li03{
    background-color:red;
    font-size: 35px;
}
.li02,.li04{
    background-color:lawngreen;
    font-size: 35px;
}
.li01:hover,.li02:hover,.li03:hover,.li04:hover{
    color: aliceblue;
    background-color: black;
    cursor: pointer; 
}